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Rocks

ICSE · Class 11 · Geography

Complete topic list for Rocks in ICSE Class 11 Geography. Key concepts, sub-topics, and what to focus on for board exams.

44 questions40 flashcards5 concepts

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A comprehensive flowchart illustrating the continuous process by which rocks are transformed from one type to another (igneous, sedimentary, metamorphic) through various geological processes like weat
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4 Topics · ICSE Class 11 Geography

Topics in Rocks

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1. Mineral Basis of Rocks

  • There are about 2,000 minerals, and only 12 are common rock-formers.
  • About 87% of the minerals in the earth's crust are silicates.
  • Rocks are aggregates of minerals; a rock may contain one mineral or many minerals.
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2. Definition and Classification of Rocks

  • Rocks are materials that form the crust of the earth, whether hard like granite or soft like clay, gravel or sandstone.
  • Rocks are aggregates of minerals.
  • Minerals in rocks exist separately and not in chemical combination.
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3. Igneous Rocks

  • The word igneous comes from the Latin word 'ignis', meaning fire.
  • Igneous rocks are formed through the solidification of molten materials.
  • Molten materials move to the surface through cracks and joints from a depth of 60-100 km.
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4. Igneous Rock Bodies

  • Batholith is the largest intrusive igneous rock body.
  • Batholiths may be 50 to 80 km across and hundreds of kilometres long.
  • A stock is a smaller batholith and is often less than 100 sq km in area.

Key Concepts

Central concept: Rocks as natural materials forming the earth's crust and their classification by origin, composition, texture, and transformation

LithosphereMineralsSilicatesCarbonatesSulphidesMetalsIgneous rocksSedimentary rocks

Frequently Asked Questions

What are the important topics in Rocks for ICSE Class 11 Geography?
Key topics in Rocks include Complete Overview of Rocks Chapter, Flowchart showing the two main types of metamorphism and resulting rock transformations, Pie chart showing the percentage composition of the eight most abundant elements in Earth's crust. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Rocks — ICSE Class 11 Geography?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 33 chapters — ICSE Class 11 Geography Syllabus

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